Let’s say that I created a contract and, using that, I and other people, made many transactions which meaning is undoubtably proven reading the contract.
At a certain point someone kills the contract ...

As title, I can't find any flag about enabling the "mailserver" when starting whisper node.
However, I found a Diagnostic Tool called "wnode"：https://github.com/ethereum/go-ethereum/wiki/Diagnostic-...

I'm trying to figure out HOW to get a sort of "history" of values for a specific ERC721 (for instance KnownOrigin)
What are the important items to consider? Is something feasible via Smart Contract ...

In building an IONIC app, I am attempting to retrieve the historical balance of a single Ethereum address. I am currently not sure how far back I will need to go. I know that Etherscan.IO offers a web ...

Let's say that someone sends me some ETH. How can I prove to a third party that I am the actual recipient of that transaction?
The third party is anyone with access to the blockchain. In other words, ...

I need calcualete balance on the date to acconut, but web3 balance and etherscan.com api is missmath. How correct to calculate balance from the available data of api.
const web3 = new Web3("https://...

I would like to read a successful transaction on an ETH block and I would like to get the values of input parameters that were passed to the function for that transaction. I am not talking of the
data ...

I had been reading up on Proof of Stake and the advantages and disadvantages. As if I am correctly informed, it is planned to change from PoW to PoS in the near future, using Casper. I had also been ...

After reading the this post, it seems like I should be able to access the logs of events that have been called on an Ethereum contract. The section I am interested in is Option 3 which is using event ...

With web3, I can access the history of the blockchain like this:
web3.eth.getBalance('0x1234') // returns current balance at address 0x1234
web3.eth.getBalance('0x1234', 1000) // returns balance at ...

I'm interested in learning the essence and background of this community and the concepts it is built upon. Beyond who founded Ethereum, who is responsible for coining terms such as block-chain? Why ...

What was the reason to invent the Ethereum Virtual Machine (EVM)? Why not use an existing virtual machine like the Java-VM. The big advantage would be that the existing toolsets for Java development ...

Different instructions of the EVM have different associated gas costs -- you can look at the list of the gas-prices in the appendix G of the yellow paper.
While the rough magnitudes of those numbers ...